Worst air pollution Hertford, today and tomorrow
Today (16 July): Air quality in Hertford is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 34.0/100).
Tomorrow (17 July 2026): Air quality in Hertford is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 43.6/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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The M1 generates consistent traffic-related NO₂ and PM2.5, particularly during peak commuting hours. The air quality picture in Hertford reflects a typical Hertfordshire town, with traffic emissions and local commercial activity as key contributors. The region's typical south-westerlies offer a degree of natural ventilation, keeping pollution broadly in line with comparable UK towns.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
10.4/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
8.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Good
12.1/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Good
14.6/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
11.3/100
Pollen forecast in Hertford
View pollen forecastFrequently Asked Questions
Is air quality bad in Hertford right now?
On 16 July 2026, overall air quality in Hertford is fair. AQI is the main air quality indicator at 34.0/100. Pollution peaks around 3:00 PM (O3: 34.0/100).
Will air quality be worse tomorrow in Hertford?
On 17 July 2026, air quality conditions in Hertford will be better than today, with AQI forecast at medium at 43.6/100. Pollution peaks around 4:00 PM (O3: 43.6/100).
When is air pollution at its worst in Hertford?
For much of spring and autumn, things settle into a fairly unremarkable middle ground. Here's the thing about Hertford: air quality has a clear seasonal rhythm. Once the heating goes on and the air turns still, pollution from the M1 and nearby chimneys tends to build up rather than clear. By summer, ozone tends to rise on bright days, while better ventilation generally keeps particulate and NO₂ levels lower than winter.
Are air quality levels in Hertford based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app